I believe the grading logic applied to Question 9 is correct on two of the quizzes, but incorrect on one of them.

The *incorrect version* has the following question:

Q. “True/False: Using the equations for the GRU and LSTM below the Update Gate and Forget Gate in the LSTM play a * different* role to

**Γu and 1- Γu.**”

My answer:

A. False

Grader says: “Incorrect! Instead of using Γu to compute 1 - Γu, LSTM uses 2 gates (Γu and Γf) to compute the final value of the hidden state. So, Γf is used instead of 1 - Γu.”

The grader is incorrect here, because in this question – on the other versions of this quiz at least – the order of the answer is strict.

In the question the order is:

“Update Gate and Forget Gate” which corresponds to Γu and 1- Γu, *respectively*. Meaning they play the **same** role. However the T/F statement declares they play a **different** role, so when we apply the same strict-order logic as the other versions of this question, is *False*, not True.

I think that the person who applied grading logic got confused because it looks like there are variables used which switch both the word **same/different** and the order of **Γu and 1- Γu** (but I can’t be sure as I can’t access the other versions, only the latest one).